package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     * 事务处理：如果菜品没有添加成功，则口味也不添加（最好在接口出添加注解）
     * */
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表中插入1条数据
        dishMapper.insert(dish);

        Long dishId = dish.getId();//useGeneratedKeys 返回主键
        List<DishFlavor> flavors = dishDTO.getFlavors();//菜品对应的多个口味
        if(flavors != null && flavors.size() > 0){
            /*flavors.forEach(f -> {
                f.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);*/

            dishFlavorMapper.insertBatch(flavors,dishId);
        }
    }

    /**
     * 菜品分页查询
     * */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());//设置参数：页码、显示数据个数
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);//条件查询
        return new PageResult(page.getTotal(),page.getResult());//PageHelper底层完成了limit分页，调用方法返回值
    }

    /**
     * 批量删除菜品
     * */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除--状态是否为启售中？？
        Long num1 = dishMapper.getByIds(ids, StatusConstant.ENABLE);
        if(num1 > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }
        //判断当前菜品是否能够删除--是否关联套餐？？
        Long num2 = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(num2 > 0){
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        for(Long id : ids){
            //删除菜品
            dishMapper.deleteById(id);
            //删除对应的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品
        Dish dish = dishMapper.getById(id);
        //根据id查询对应的口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getById(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }
    /**
     * 修改菜品
     * */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        //因为口味数量不确定，所以先删除原有的口味数据再重新插入新的
        Long dishId = dish.getId();//该功能的SQL不用useGeneratedKeys来返回主键，因为这是修改，之前已经存在，主键传进来了
        dishFlavorMapper.deleteByDishId(dishId);

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            dishFlavorMapper.insertBatch(flavors,dishId);
        }


    }

    //根据分类id查询菜品
    @Override
    public List<Dish> selectByCategoryId(String categoryId) {
        List<Dish> dishes = dishMapper.selectByCategoryId(categoryId);
        return dishes;
    }

    //根据名称查询菜品
    @Override
    public List<Dish> selectByName(String name) {
        List<Dish> list = dishMapper.selectByName(name);
        return list;
    }

    //客户端
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);//多个菜品

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);//分类id、状态、菜品id
        }

//        List<DishVO> dishVOList = dishMapper.listWithFlavor(dish);//通过多表查询（但会出现序列化等一系列异常）
        return dishVOList;
    }
}
